5. Zolotarev V. A., Zdanovich A. A., Karimov O. V. et al. Pervaja mirovaja vojna 1914-1918 godov. V6 tomah. Tom 4. Vojna na more [World War I (1914-1918). In 6 vols. Vol. 4. Naval Warfare]. Moscow, Kuchkovo Field Publ., 2017, 848 p. (In Russian).
6. Novikova I. N. “Mezhdu molotom i nakoval'nej”. Shvecija v germano-rossijskom protivostojanii na Baltike v gody Pervoj mirovoj vojny [“Between the Hammer and the Anvil”. The Role of Sweden in Russia- Germany Opposition in the Baltic Sea Area during World War I]. St. Petersburg, St. Petersburg State University Publ., 2006, 450 p. (In Russian).
7. Pavlovich N. B. Razvitie taktiki voenno-morskogo flota. V 4 chastjah. Chast' 3. Ot Pervoj mirovoj do Vtoroj mirovoj vojny [The Development of Naval Tactics. In 4 parts. Part 3. From World War I to World War II]. Moscow, Voenizdat Publ., 1983, 424 p. (In Russian).
8. Petrov V. A. Naval Intelligence in the Baltic Sea Area before and during World War I. Gangut [Gangut]. 1999, no. 19, pp. 96-104. (In Russian).
9. Flot v Pervoj mirovoj vojne. V 2 tomah. Tom 1 [Navy during World War I. In 2 vols. Vol. 1]. Moscow, Voenizdat Publ., 1964, 648 p. (In Russian).